Design of lightweight concrete slabs under two-way shear without shear reinforcements: A comparative study and a new formula

The use of nondestructive testing (NDT) techniques to estimate concrete in-place strength has been broadly studied, with proof of their usefulness in complementing destructive testing (DT). However, the use of DT techniques still dominates. The main objective of this investigation was to compare the performance of three NDT techniques—the rebound hammer, Nitto hammer, and pullout tests—to determine in-place strength. NDT-versus-strength correlation curves were fit to data measured from thick concrete slabs. Strength was measured from cast-in-place cylinders. Analyses of NDT sensitivity, uncertainty, and variability are presented. A new parameter to quantify the performance of the NDT techniques is proposed. This parameter is the limit error between the measured and estimated strengths, which combine uncertainty and variability analyses. The analysis shows that the least limit error for predicting in-place strength was achieved by the rebound hammer test when one testing location was considered or by the pullout test for two or more testing locations.

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A comparative study of shear design methods for straight and skew concrete slabs

Engineering Structures ◽

10.1016/j.engstruct.2019.109515 ◽

2020 ◽

Vol 208 ◽

pp. 109515

Author(s):

Alessandro Lipari

Keyword(s):

Comparative Study ◽

Design Methods ◽

Concrete Slabs ◽

Shear Design

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Instantaneous deflection of self-compacting and lightweight concrete slabs at early-age

Engineering Solid Mechanics ◽

10.5267/j.esm.2018.2.001 ◽

2018 ◽

pp. 143-154 ◽

Cited By ~ 1

Author(s):

Behnam Vakhshouri ◽

Shami Nejadi

Keyword(s):

Lightweight Concrete ◽

Concrete Slabs ◽

Early Age

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Experience of using high-rigidity bearing reinforcement in monolithic lightweight concrete slabs

MATEC Web of Conferences ◽

10.1051/matecconf/201926505031 ◽

2019 ◽

Vol 265 ◽

pp. 05031

Author(s):

Artem Davidyuk ◽

Tejmuraz Guladze ◽

Yuliya Kustikova ◽

Timofey Laryushkin

Keyword(s):

Lightweight Concrete ◽

Concrete Slabs ◽

Reinforcing Bars ◽

High Rigidity

The article describes the experience of erecting lightweight concrete monolithic slabs with the use of reinforcing bars of increased rigidity. As a result, a reduction in costs of 25 ... 30%, compared with the floors of heavy concrete without pre-stressed reinforcement is reached.

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